Srovnání a optimalizace zjišťování modulu pružnosti betonu

COMPARATION AND OPTIMALIZATION OF DISCOVERING ELASTICITY MODULE OF CONCRET

conference paper

Czech

Již dávno je dokázané, že lze měnit moduly ztvrdlé betonové směsi bez toho, aby se změnila její pevnost. Pierre-Claude Aitcin tomu ve své knize Vysokohodnotné betony [1] věnuje celou jednu kapitolu, kde důkladně rozebírá způsoby ovlivňování pevností v tlaku ve vztahu k modulu pružnosti. V základě jde o kvalitní spojení kameniva s cementovým tmelem, vlastnosti kameniva výrazně ovlivňují pružnostní charakteristiky vzorku. Poměr tohoto ovlivnění je také znám, uváděn ve zmiňované knize v kap. 16.4.2.

The module of elasticity is one of the demanded characteristic from investors and designers of concrete structure. To estimate the actual value of module is much harder than to evaluate the compressive strength. There is need to improve the measurement system for the elastic modules. During few lines I should explain, what was done in there. There were 22 specimens of the shape block and cylinder. The first part of the test was measuring dimensions and weight, estimating the volume weight. Other doing was checking the time that goes ultrasound impulse trough the beam. Secondly find the own frequency using resonance method. The values of dynamic elastic modulus from these two measurements are nearly equal. The selected specimens are tested on static bending modulus and compressive modulus. Comparing these static and the other two dynamic tests we could see very near results (view table). The empirical formula should be estimated up on these or more values.

srovnání, optimalizace, modul pružnosti

comparison, optimization, modulus of elasticity

HLAVÁČ, Z.

2007

24. 1. 2007

FAST, VUT v Brně

Brno

978-80-214-3337-3

Sborník, Juniorstav 2007

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